Derrick



Nrrnn STATES PATENT ()FFICE NICHOLAS JEN SEN,.OF MILWAUKEE, lVISOONSIN.

DERRiCK.

SPECIFICATION forming part of Letters Patent No. 852,543, dated November 16, 1886.

Application filed March 25, 1886. Serial No. 196,494.

To all whom it may concern:

Be it known that I, NICHOLAS JENSEN, of Milwaukee, in the county of-Milwaukee and State of Wisconsin, have invented new and useful Improvements-in Derricks'; and I do hereby declare the following to bea full,clear, and exact description of said invention, reference being had to the accompanying drawings, andto the letters or figures of reference marked thereon,which fornia part ofthis specification.

The object of my invention is toprovide a simple, inexpensive, readily-constructed, and efficient derrick for hoisting and carrying for short distances large stones or other heavy and bulky material. All these results are accomplished by the device hereinafter described and claimed.

Figure 1 is an elevationof my derrick. Fig.

2 is an end view of one of thcsetofposts. Fig. 3 is a modified form of hoisting-tackle. Two sets of posts,A and B,each set consisting of the stationary legs Oand D and the adjustableleg E, are set up vertically, one, A, near to and just to rear of location of the material to be moved, and the other, B, near to and just beyond the point to which the material is to be carried. The legs 0 and D are fixed and made rigid at the bottom in the foot-piece F, and are connected together at the top by cross pieces G G, bolted to each leg, the top of the legs 0 D being separated sufficiently to take the leg E between them and permit of its adjustment up or down by means of bolts H H, passing through the cross-pieces and theleg E or other equivalent means.

A supporting or track rope, I, is attached to the post A, near its top, and extends from post A to post B and passes over pulley J,the block of which pulley is attached to the post B, near its top, and runs down and winds upon the Windlass K, which Windlass rotates in bearings in the lower part of post B. The

- Windlass K isprovided with a bell-crank handle, L, or other equivalent device, whereby it may be operated. A pulley, M, is supported and travels freely on the rope I, between posts A and B, and attached to and supported by pulley M is a double pulley, N, the blocks of which pulleys M and N are attached to each other. A hoisting and draft rope, O, is attached at one end to the block of pulley N, and is (No model.)

doubled about and runs over the free pulley P and the pulley N, and thence runs over the pulley Q, the block of which is attached to the post B, and down to and under the pulley R, the block of which is attached toa post, S,fixed in the ground, the free end of this rope being adapted to take the power for hoisting and carrying the material to be elevated and moved. A retrieving-rope, F, is attached at one end to the block of pulley M, and passes over a pulley, U, the block of which is attached to the post A, and for securing its lower end may be tied to or wound upon the cleat V,rigid to the lower part of the post A.

W WV are stay-ropes or guysattached to the upper ends of the posts A and B, respectively, and at their lower outer ends to the ground or some fixed object, whereby the posts are stayed or held steadily in position against being pulled inwardly by the weight of the materialhoisted or carried.

Y represenls a block of stone supported on the tackle P.

It will be seen that by loosening the rope O at its free end, and at the same time pulling upon the retrieving-rope T, the pulley M and its supported mechanism may be drawn back nearto the post A; that upon further loosening the rope O the block P will be lowered to the ground; and, being attached to a load, Y, by hauling on the rope O at its free outer end the weight will be raised, (th'e'r'ope T being fastened at its lower end,) and thereupon by continuing to pull on the rope O, and gradually releasing the retrievingrope T, the pulley M and its supported mechanism and load will be carried forward on the supporting-rope I, toward the post B, and the load can be lowered and deposited at any point on the route between the two posts by releasing the rope O. The supporting-repel can be let down or made taut by unwinding or winding it up on the Windlass K.

So far as the post A is concerned, a single upright standard, or even the wall of a building to which the rope I and pulley-block U can be attached, will serve as the equivalent for the post; and where the Weight to be elevated is not too heavy a single pulley, N,Fig. 3,with the rope 0 running singly over it, may be used instead of the double pulley N, single pulley P, and rope O, doubled between them. What I claim as new, and desire to secure by Letters Patent, is-

1. The combination of the posts A B, the 5 latter being provided with a pulley, J, and a Windlass, K, the supporting-rope I, attached to the post A and passing over the pulley J on the post B, and winding upon a Windlass, K, the traveling pulley M, provided with a 10 retrieving-rope, T, the pulley-block N, and the hoisting-rope O, substantially as described. 2. The combination of two posts, A and B,

the supporting-rope I, aflixed to post A and running over pulley J, attached to post B, and

winding on Windlass K, the traveling pulley M, provided with retrieving-rope T and supporting the two pulleys N and P, and the hoisting-rope O, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

NICHOLAS JENSEN.

Witnesses:

O. T. BENEDICT, G. M. GRIDLEY. 

